JPH10128445A - Mandrel for winding coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set the most suitable crown amount corresponding to the winding condition of the winding weight of a metal strip and the winding tension, etc. SOLUTION: The mandrel is constituted to wind a metal strip into a coil. In this case, a circular cylinder like segment is composed by combining segment part pieces in cross sectional circular-arc shape and quadri-divided in the circumferential direction, three sets of circular-cylinder like segments 1A, 1B, 1C are installed parallel in the axial direction and wound with the metal strip to make a laminated mandrel body 1, and the mandrel body 1 has a mandrel crown variable mechanism which spreads or retracts their outside diameters individually.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil winding mandrel for winding a metal band such as a thin wide band steel (strip) into a coil.

[0002]

2. Description of the Related Art In a recoiler line for rewinding a coil-shaped steel strip (strip) in a steel process, a coil winding machine for winding a steel strip subjected to width reduction processing (side trimming processing) or the like is installed. The coil winder is provided with a coil winding mandrel, which is a center rod (core metal) that winds a steel strip and winds it into a coil, as a main component thereof.

FIG. 5 is a view schematically showing a conventional coil winding mandrel. As shown in the figure, a conventional coil winding mandrel is formed by combining a segment 51a having an arcuate cross section and extending in the axial direction so that the wound coil can be extracted from the mandrel. The cylindrical mandrel main body 51 is divided into four equal parts. This mandrel body 51
The outer peripheral surface (steel band winding surface) extending in the axial direction is flat and straight cylindrical. And the mandrel body 5
By moving a central shaft with a wedge (not shown) provided inside 1 in the axial direction, each segment 51a moves in the radial direction, and the wound coil can be extracted by reducing and changing the mandrel diameter. .

FIG. 6 is a view for explaining a deformation of the mandrel when the coil winding mandrel shown in FIG. 5 is used, and FIG. 7 is a view for explaining an ear wave generated at a winding start portion of the coil shown in FIG. FIG.

In FIG. 6, reference numeral 52 denotes a straight cylindrical rubber sleeve having a flat outer peripheral surface extending in the axial direction. In winding the thin steel strip, the mandrel body 51 is used to prevent the edge extending in the sheet width direction at the tip of the steel strip from being transferred as a flaw (end mark) on the steel strip wrapped portion of the next layer or later. Winding is performed with the rubber sleeve 52 fitted outside.

As shown in FIG. 6, when the steel strip S is wound, the mandrel body 51 and the rubber sleeve 52 have a larger recess at the center than at the ends due to the surface pressure caused by the winding of the steel strip S. Compression deformation. As a result, FIG.
As shown in the figure, the winding start portion of the wound coil W (the inner circumferential portion of the coil) is similarly deformed, and the width center C of the steel strip S is compressed and deformed with respect to the width end. To receive
An ear wave is generated in the steel strip S at the winding start side of the coil W.
Note that the ear wave is a wave in which a wave appears at an end portion of the width of the plate and the center portion of the plate is flat, and is also called an external wave or ear extension.

Therefore, in order to eliminate the generation of ear waves due to such winding, as shown in FIG. 8, the outer surface of a cylindrical body for winding a steel strip has a moderately high curved surface. Has been proposed (Japanese Utility Model Laid-Open No. 3-9220). When the spool 53 with the middle and high crown is used by being fitted to the mandrel main body 51, a middle and high crown (convex crown) is applied to the spool so as to cancel the compressive deformation due to the surface pressure at the time of winding the steel strip. As a result, no compression deformation occurs on the coil winding start side during winding, and generation of ear waves is prevented.

[0008]

By the way, the crown amount at the middle height which is optimal for preventing the generation of the ear wave differs depending on the winding condition. For example, even if the thickness and width are the same, if the winding weight of the steel strip increases, the amount of compressive deformation of the mandrel body increases, so that it is necessary to increase the crown amount to prevent generation of ear waves. On the other hand, if the crown amount is too large, the central portion of the steel strip in the sheet width is oppositely subjected to tensile deformation, so that medium elongation occurs.

In the case of using the above-mentioned spool with a middle and high crown externally fitted to the mandrel main body, a middle and high crown with an optimum crown amount is used according to the winding conditions such as the winding weight and winding tension of the steel strip. There is a drawback in that it is necessary to prepare spools individually, and replacement of the spools is troublesome, leading to a decrease in productivity.

In view of the above, the present invention provides a coil winding mandrel having a variable mandrel crown mechanism capable of varying the crown height at the middle and high levels, so that the winding condition such as the winding weight and winding tension of the metal band can be adjusted. An object of the present invention is to provide a coil winding mandrel in which an optimal crown amount can be set and the flatness of the metal band wound in a coil shape is not deteriorated by generation of ear waves due to winding. I do.

[0011]

In order to achieve the above-mentioned object, a coil winding mandrel according to the present invention has a circular cross section in a coil winding mandrel for winding a metal band and winding it in a coil shape. Combine the segment pieces into a cylindrical segment that is divided into a plurality of pieces in the circumferential direction, and a plurality of these cylindrical segments are arranged in the axial direction to form a mandrel main body that is wound around a metal band and laminated, and the outer diameter of each of the cylindrical segments is Are provided with a variable mandrel crown mechanism for independently expanding and contracting each of them.

In the coil winding mandrel according to the present invention, the outer diameter of each of the axially arranged cylindrical segments constituting the mandrel main body can be independently enlarged and reduced by the variable mandrel crown mechanism. It is possible to set the optimum crown height in accordance with winding conditions such as winding weight and winding tension,
By expanding and reducing the outer diameter of each cylindrical segment by the same value, the outer diameter of the mandrel body can be expanded and reduced as a whole as in the conventional case. Note that at least three sets of cylindrical segments are required.

[0013]

FIG. 1 is a perspective view schematically showing an example of a coil winding mandrel according to the present invention, FIG. 2 is a schematic sectional view of the coil winding mandrel of FIG. 1, and FIG. FIG. 5 is a view for explaining the expansion and contraction operation of the coil winding mandrel of FIG.

As shown in FIG. 1, in this example, a cylindrical segment divided into four equal parts in the circumferential direction is formed by combining steel segment pieces SP having an arc-shaped cross section. In this example, three sets of cylindrical segments are formed. A mandrel main body 1 is formed by arranging segments 1A, 1B, and 1C side by side in the axial direction and winding and laminating a metal band.

As shown in FIG. 2, inside the mandrel main body 1, an inner cylindrical body 2 extending in the axial direction also serving as a hydraulic pipeline is disposed, and the cylindrical segments 1A, 1
Each of the segment pieces SP constituting B and 1C is fixed to the inner cylindrical body 2 by a tension coil spring 3 so as to be movable in the radial direction. At a position corresponding to the cylindrical segment 1A in the inner cylindrical body 2, a total of four hydraulic pressure adjusting valves 4A are arranged corresponding to the four segment pieces SP constituting the cylindrical segment 1A. By adjusting the opening degree of each hydraulic pressure adjusting valve 4A, each segment piece SP can be moved in the direction of the arrow in the drawing against the tension coil spring 3 by hydraulic action.

Similarly, a total of four hydraulic pressure adjusting valves 4B are provided on the inner cylindrical body 2 in correspondence with the four segment pieces SP constituting the cylindrical segment 1B located at the center in the axial direction. Similarly, a total of 4 corresponding to the four segment pieces SP constituting the cylindrical segment 1C located on one end side in the axial direction.
The four hydraulic pressure adjusting valves 4C are provided. The inner cylindrical body 2, the hydraulic pressure adjusting valves 4A, 4B, 4C and the extension coil spring 3 are each composed of a cylindrical segment 1A, 1B, 1
A variable mandrel crown mechanism for independently expanding and contracting the outer diameter of C is provided.

In the coil winding mandrel of this embodiment having the above-described configuration, as shown in FIG.
Set and adjust the opening of B larger than the other valves 4A and 4C,
By making the outer diameter of the cylindrical segment 1B located at the center larger than that of the other cylindrical segments 1A and 1C, the mandrel main body 1 can be adjusted according to winding conditions such as the winding weight and winding tension of the metal band. In this case, it is possible to provide an optimum middle and high crown amount.

[0018]

Next, using the coil winding mandrel of this example having the above-described configuration, coil winding of a mild steel cold-rolled wide band steel (strip) was performed on a recoiler line, and the ear before winding was obtained. The difference between the wave and the ear wave after winding was examined as the amount of change in the ear wave. The strip has a thickness of 0.6 mm and a width of 1000 mm. As shown in FIG. 4, the crown amount Δx at the middle height is Δx = (d ₂ −d ₁ ), and the diameter d ₁ of the used mandrel is 610 mm. The mandrel body 1 was wound with the above-mentioned rubber sleeve having a flat outer peripheral surface and a straight cylindrical shape fitted onto the outer periphery. Table 1 shows the results.

[0019]

[Table 1]

As shown in Table 1, in Comparative Example 2 in which the crown amount was zero, the flatness of the strip was deteriorated due to generation of ear waves due to winding. Further, in Comparative Example 1 in which the crown amount was fixed to a fixed value, the ear wave preventing effect by the middle and high crowns was obtained only in the case of a specific winding weight and winding tension. On the other hand, in the example of the present invention, no. By giving the optimum crown amount according to each of the winding conditions 1 to 4, the amount of change in the ear wave could be made substantially zero under each of the winding conditions.

[0021]

As described above, according to the coil winding mandrel according to the present invention, since the mandrel crown variable mechanism capable of changing the crown amount at the middle and high levels is provided, the winding weight and winding of the metal strip are provided. The optimum crown amount can be set according to the winding conditions such as the take-up tension, and the conventional work of replacing the mandrel with the optimum crown amount according to the winding conditions is no longer necessary. Can be improved in productivity.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing an example of a coil winding mandrel according to the present invention.

FIG. 2 is a schematic sectional view of the coil winding mandrel of FIG. 1;

FIG. 3 is a view for explaining an expanding / contracting operation of the coil winding mandrel of FIG. 1;

FIG. 4 is an explanatory diagram of a crown amount of a coil winding mandrel.

FIG. 5 is a view schematically showing a conventional coil winding mandrel.

6 is a view for explaining deformation of the mandrel when the coil winding mandrel shown in FIG. 5 is used.

FIG. 7 is a view for explaining an ear wave generated at a portion on the winding start side of the coil shown in FIG. 6;

FIG. 8 is a sectional view of a conventional spool with a middle and high crown.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Mandrel main body 1A, 1B, 1C ... Cylindrical segment 2 ... Inner cylindrical body 3 ... Tension coil spring 4A, 4B, 4C ... Hydraulic pressure adjustment valve 51 ... Mandrel main body 52 ... Rubber sleeve
53 ... Spool with middle and high crown SP ... Segment piece S ... Steel strip W ... Coil

Claims (1)

[Claims] 1. A coil winding mandrel which winds a metal band and winds it into a coil shape. A cylindrical segment which is divided into a plurality of pieces in the circumferential direction by combining segment pieces having an arc-shaped cross section. A mandrel main body for arranging a plurality of metal strips in parallel in the axial direction and winding and laminating a metal band, and having a mandrel crown variable mechanism for independently expanding and reducing the outer diameter of each of the cylindrical segments. Mandrel for taking.